Discussion
If a circle with 1 cm radius represents one lac population, what will be the radius of the circle representing 4 lac population ?
Answer: B
The area of a proportional circle is proportional to the population, so the radius is proportional to its square root. If a circle of 1 cm radius shows 1 lakh, then 4 lakh needs a circle of radius 1 times the square root of 4, which is 2 cm. Options 1 cm and 4 cm do not follow the square root rule, and 16 cm would be the answer only if the radius were proportional to the square of the population, so the answer is 2 cm.
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